Updated at 11:39 a.m. on Aug. 6.

Democrat Mark Begich is one of the few senators who haven't announced their votes on Sonia Sotomayor's confirmation. His fellow Alaskan, Lisa Murkowski, says the wait can't be pleasant.

Murkowski, a Republican, announced on the Senate floor Wednesday that her constituents' "overwhelming concern" on their right to bear arms compelled her to vote no. Begich, a newly elected Democrat in a conservative state, could be facing even more pressure, she noted later in an interview with NationalJournal.com.

Curt Levey, executive director of the conservative Committee for Justice, said voting against confirmation "would be a great way to show that he is not another Eastern liberal, that he hasn't been captured by Eastern liberals." His organization has been running ads in Alaska targeting both senators. In addition, the National Rifle Association is scoring senators based on their confirmation votes.

Sen. Sheldon Whitehouse of Rhode Island, a Democratic member of the Senate Judiciary Committee, told NationalJournal.com that it's possible a red state Democrat could vote no because of Second Amendment issues. "I think it's possible, and I think it would be a very strong signal about how politicized this process has become," Whitehouse said. Republicans want Sotomayor "to be an advocate for the expansion of the Second Amendment," he said. He added that the "fact that the NRA is involved pressing it only adds an exclamation point to it."

Begich's office told the Anchorage Daily News that he likely won't announce his vote until the official vote today, slated for 3 p.m. So, could he be the lone Democrat voting against Sotomayor's nomination? "That I don't know," Murkowski told NationalJournal.com. "... But if I have been receiving this kind of input from folks back home, I'm sure he has as well."

UPDATE: The original version of this report listed Sen. Blanche Lincoln, D-Ark., as undecided. She announced she would vote for Sotomayor's confirmation minutes after this report was posted.