Photo by Toby Alter.

“Sharp” is a word you may have heard a lot these past few days. It’s a favorite descriptor for Paul Ryan, the Wisconsin representative who became Mitt Romney’s running mate as of Saturday morning. Sharp, say friends and foes alike, are Ryan’s appearance, his mind, his criticisms of President Barack Obama, the spending reductions he favors — and now, somewhat suddenly, the contrast between the policies embodied by the presumptive Republican challengers and those of the incumbent Democrats. It is a perceived sharpness that itself stands in contrast, of course, to Mitt Romney’s pre-Ryan candidacy, which many commentators found too muddled and many conservatives found too moderate.

Take transportation, for instance. Romney, as Transportation Nation observed, spoke and behaved as a metro-friendly moderate when he was governor of Massachusetts. Romney’s transportation budgets were modally balanced, with an emphasis on fixing what already existed, and he worked hard to create a new state agency to encourage smart growth development and sustainability. A candidate who still believed in those principles might not have many sharp things to say about transportation in a debate with President Barack Obama.

The Obama administration subscribes to the belief, by no means exclusive to liberals, that infrastructure spending is crucial to creating jobs and keeping America competitive. Judging from Paul Ryan’s budget blueprint, the newly tapped V.P. candidate takes issue not with just the dollar figures required to test Obama’s idea, but the philosophy itself.

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As high-speed rail advocates and transit-friendly bloggers are already aware, Ryan will bring plenty of sharp contrast to the presidential campaign. Yonah Freemark of Transport Politic put it neatly:

Mr. Ryan voted against every piece of transportation legislation proposed by Democrats when they controlled the lower chamber between 2007 and early 2010, with the exception of a bill subsidizing the automobile industry to the tune of $14 billion in loans in December 2008. This record included a vote against moving $8 billion into the highway trust fund in July 2008 (the overall vote was 387 to 37), a bill that was necessary to keep transportation funding at existing levels of investment. Meanwhile, he voted for a failed amendment that would have significantly cut back funding for Amtrak and voted against a widely popular bill that would expand grants for public transportation projects. He did vote in favor of the most recent transportation bill extension.

These votes of Ryan’s weren’t a matter of toeing the party line, either. Republican House Transportation Chair John Mica, for instance, took the other side on every one of these votes except the failed amendment cutting funding for Amtrak.

But no budget hawk is perfect. Ryan did show a certain weakness for transportation dollars back when George W. Bush was president. In July of 2005, he joined the 412-8 majority in voting for the infamously pork-laden, “bridge-to-nowhere”-building reauthorization bill SAFETEA-LU. And then he sent out a press release listing all of the earmarks he had won for his district, including $7.2 million for the widening of I-94 between the Illinois state line and Milwaukee, $3.2 million for a bypass around Burlington, and $2.4 million for work on I-43 in Rock County. Small authorizations were also secured for preliminary engineering work on the Kenosha streetcar expansion project and Kenosha-Racine-Milwaukee commuter rail. Ryan’s press release boasted that the state of Wisconsin was still a donee state, getting back $1.06 for every federal tax dollar, up from $1.02 the previous authorization. But “there’s no gas tax increase, and it draws on the Highway Trust Fund — not general revenues — for transportation spending, and it’s fair for Wisconsin gas tax payers.”

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Five years later, as we know, it became unfashionable, gauche even, to be seen indulging in earmarks and other federal largess. In November 2010, that Tea Party autumn, Republican Scott Walker won the governorship of Ryan’s home state of Wisconsin after a campaign that made a major issue of the Milwaukee-to-Madison high-speed rail “boondoggle.” In a television commercial, Walker said he’d rather use the $810 million to fix Wisconsin’s roads and bridges. But the money wasn’t fungible. As Walker and Florida Gov. Rick Scott (R) soon had to admit, turning down the money only meant re-gifting it to high-speed rail projects in other, bluer, more grateful states.

Paul Ryan tried to change that. Just a few days after Walker’s election, he and two fellow Wisconsin Republicans co-sponsored legislation in the House to order returned high-speed rail money deposited into the general fund for the purposes of deficit reduction. The bill would have changed the political dynamic of federal high-speed rail funding had it passed, placing new pressure on any governor who accepted those grants. For whatever reason, the bill never left committee.

When Ryan became chair of the House Budget Committee in 2011, he put forth a 2012 budget [PDF] that, reflecting Ryan’s commitment not to raise the gas tax or draw from the general fund, reduced transportation spending from its 2011 level of $95 billion gradually down to $66 billion in 2015. That was at a time when the Obama administration was proposing a six-year infrastructure outlay of $476 billion “to modernize the country’s transportation infrastructure, and pave the way for long-term economic growth.”

But there’s the rub. Chair Ryan refutes that premise. In his budget, transportation spending is not economic investment. To quote the 2013 budget:

In the first two years of the Obama administration, funding for the Department of Transportation grew by 24 percent — and that doesn’t count the stimulus spike, which nearly doubled transportation spending in one year. The mechanisms of federal highway and transit spending have become distorted, leading to imprudent, irresponsible, and often downright wasteful spending. Further, however worthy some highway projects might be, their capacity as job creators has been vastly oversold, as demonstrated by the extravagant but unfulfilled promises that accompanied the 2009 stimulus bill, particularly with regard to high-speed rail.

The document goes on to say that the country’s fiscal challenges make “long-term subsidization infeasible,” and that “high-speed rail and other new intercity rail projects should be pursued only if they can be established as self-supporting commercial services.” (It’s unclear whether Ryan believes that new highways should also be built as self-supporting commercial services. But he should give Rick Perry a call before saying so publicly.)

With Ryan now on the Republican ticket, one can see more clearly the (sharper) contours of the general election debate, and infrastructure spending might just have a starring role. It’s there in the debate over the federal budget, and the federal funding role. It’s at the crux of the hullabaloo over “You didn’t build that” (a government theory Elizabeth Warren articulated better). And it will be there when Paul Ryan debates Amtrak Joe.