Sen. Judd Gregg, dean of the New Hampshire congressional delegation, will endorse Mitt Romney today at the state capitol, the Union Leader reports this morning. Gregg will join Romney before the former governor treks across the street to file papers to officially become a candidate on the New Hampshire ballot. A top Gregg adviser, Tom Rath, was an early Romney backer.

Gregg's endorsement means two of the Granite State's four members of Congress have chosen a candidate. Freshman Democratic Rep. Paul Hodes threw his support behind Barack Obama in July. Spokespeople for Democratic Rep. Carol Shea-Porter and Republican Sen. John Sununu were not immediately available to answer questions about whether their bosses would endorse.

Former Gov. Jeanne Shaheen, who is running against Sununu in 2008, is not backing a candidate, though her husband Bill is supporting Hillary Clinton. And Gov. John Lynch, also a Democrat, has remained neutral thus far.

No one from the Iowa delegation has publicly picked a candidate, though several South Carolinians have endorsed. Sen. Jim DeMint is on Romney's team, while Sen. Lindsey Graham is backing John McCain. Rep. Gresham Barrett is on board with former Sen. Fred Thompson.