Gay Marriage Advocates Kucinich, Gravel Barred From NH Debate

ABC said the candidates left out of the debates failed to meet benchmarks for their support that were outlined to each campaign prior to the Iowa caucus. Kucinich did not complain about these rules ahead of time, said spokeswoman Cathie Levine, who had no further comment since she hasn't seen the FCC filing.

ABC said it hoped to encourage more conversation and interaction among the candidates during the debates, which will both be moderated by Charles Gibson. The stakes are high as candidates take the stage three days before the New Hampshire primary.

The Republican debate will include Iowa caucus winner Mike Huckabee, John McCain, Rudy Giuliani, Fred Thompson, Mitt Romney and Ron Paul. It starts at 7 p.m. EST.

Shortly after that 90-minute forum, Democrats Barack Obama, Hillary Clinton, John Edwards and Bill Richardson will take the stage at St. Anselm College in Manchester, N.H.