Pressure is mounting on super delegates from upcoming primary states to make their endorsements now, and two members of Congress, thus far uncommitted, say their endorsements could come soon. Still, they worry the Democratic nominating contest has already gone on too long, and that it could permanently harm the party.

Speaking on Politics Nation Radio on Saturday, North Carolina Rep. David Price and Pennsylvania Rep. Jason Altmire maintained they have not made their decisions final, but that a choice could come shortly. "I'm thinking about [an endorsement]. There's certainly a good argument for going ahead in this kind of situation and doing what seems best in terms of trying to influence the outcome here," Price said. But, he said, "I may have an announcement fairly soon."

Price's district comprises the Tar Heel State's so-called Research Triangle, which encompasses several major universities and is about one-fifth African American. "Obama has a good lead here, but it's a hard-fought situation," Price said of the whole state and of his own district. Despite reports on Sunday and Monday that North Carolina Democratic members of Congress were moving toward endorsing Obama en masse, Price said he didn't think the group would make a joint announcement. "We have not moved as a delegation, and probably won't in any one direction," he said.

Altmire, whose western Pennsylvania district includes several Pittsburgh suburbs, is more worried about the effect the contest will have on the party. "Whenever I attend one of these rallies for one of the candidates and it shows up in the paper, we get flooded with calls in our office with people who have supported me saying, 'If he votes for that candidate or endorses that candidate I'm never going to support him again,'" Altmire said on Politics Nation. "And that's my biggest fear, is that this is starting to become so tense between the two campaigns and there's such animosity that it's driving a wedge between people who should be all focused on the same goal, which is winning back the White House."

After attending one rally last week, at which Senator Bob Casey endorsed Obama, Altmire still hasn't made up his mind. "I'm taking advantage of the opportunity that both candidates and their surrogates are spending a lot of time in western Pennsylvania and in my district," he said. Still, his largely blue collar suburbs are likely to go heavily for one candidate. "If the election were held today, in my district and in my region, ... Senator Clinton would win," he said. "But I think Senator Obama is certainly working hard and going to do everything he can to at least minimize the margins if not win outright."

The Obama campaign has "I think a more global strategy with regard to the state than just focusing on regions," Altmire concluded. Obama "does have the chance to [win], although I would say again that Senator Clinton is the favorite." Regardless of the outcome, Altmire said he will attend the Democratic National Convention in Denver in late August.

While Altmire's Pennsylvania has gone Democratic in recent decades, Price's North Carolina remains more solidly Republican. Altmire said his district is likely to go heavily for John McCain, so that electability is less of an issue for him, but it's something that is at least on Price's mind. "It's certainly a consideration that unpledged delegates, including myself, need to take into account," Price said.

Listen to Price's and Altmire's comments in this space tomorrow, when we post the full two-hour audio of XM Radio's Politics Nation.