Former South Carolina Gov. Mark Sanford (R) spent Wednesday morning "debating" a cardboard cutout of House Minority Leader Nancy Pelosi (D-Calif.) — a stunt highlighting Democrat Elizabeth Colbert Busch's refusal to agree to more debates before their May 7 House election.

"My opponent continues to run a stealth campaign, avoiding public appearances and refusing to commit to televised forums for the benefit of 1st district voters," said Sanford, who then took a shot at her donations from major Democrats and labor groups. 

"Since Elizabeth Colbert Busch refuses to articulate her views publicly, we are left to draw inferences for what she stands for on the basis of the groups that have made substantial monetary investments on her behalf."

The gun control group founded by former Rep. Gabrielle Giffords (D-Ariz.) and her husband Mark Kelly, launched radio attacks Wednesday against Republican Sens. Kelly Ayotte (N.H.) and Mitch McConnell (Ky.), the first two targets in a grassroots campaign against lawmakers who opposed legislation to expand background checks.

Iowa Agriculture Secretary Bill Northey (R) may be "just days" away from a decision on running for the Senate — and he sounds like he's leaning toward a run.

The longtime chairman of the Senate Finance Committee faced a difficult reelection contest in Montana.

Kentucky Secretary of State Alison Lundergan Grimes is still taking time to mull a Senate bid with her family and supporters, she said on Tuesday.

Daines could give Montana Republicans' chances a boost at winning the seat in the GOP-leaning state.

Sen. Jeanne Shaheen (D-N.H.) leads every potential Republican challenger by double digits in a new poll, but former Massachusetts GOP Sen. Scott Brown could be the party's best chance at challenging her in 2014.

Iowa Lt. Gov. Kim Reynolds (R) will not run for Senate in Iowa, eliminating one of the GOP's strongest opportunities at taking retiring Sen. Tom Harkin's (D) seat.

"Looking at Washington, D.C., from Montana, there is no bigger broke-down pickup than the Senate," Schweitzer told The Hill.