Sandhya Dirks

With immigration a hot-button issue in Washington, some version of immigration reform is likely this year. Even so, immigrant activist Sandra Sanchez concedes that the country might not be ready for an overhaul of its immigration laws.

Sanchez, director of the American Friends Service Committee Iowa's Immigrants Voice Program, doesn't mean that in political terms, but in practical ones. "We need to be prepared for the wave of millions of potential applicants that will be needing ... legal services," she says. "And we will not have enough resources to serve them."

Both campaigns want to claim momentum heading into the final days of the campaign. This is especially true in battleground states like Iowa, where enthusiasm and voter turnout can make all the difference.

It's a common political metaphor — momentum — but is it a good one?