Voters in Coral Gables, Fla., prepare to vote in the state's presidential primary, Jan. 29, 2008. Wilfredo Lee/AP hide caption

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Kansas Secretary of State Kris Kobach says the Sept. 11, 2001, terrorist attacks energized him around the issue of illegal immigration. "We discovered that five of the 19 hijackers had been in the country illegally," Kobach says. Ed Zurga/AP hide caption

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Then-Sen. Barack Obama drew enthusiastic crowds at a rally in Columbus, Ohio, just days before the 2008 election. Now, after a few rocky moments with the coalition that helped send him to the White House, and with a re-election battle looming, Obama is trying to re-energize his supporters. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images