Washington (CNN) - One day after delivering an upbeat view of his party's chances this November, Vice President Joe Biden is back on the campaign trail Monday, helping two fellow Democrats facing tough contests the midterm elections.
Monday afternoon, Biden attends a political event in Philadelphia for Bryan Lentz, the Democratic nominee for Pennsylvania's seventh congressional district, in the southeast part of the state. Lentz, a representative in the Pennsylvania State House and a former U.S. Army officer who served in Iraq, is facing off against former U.S Attorney and former Delaware County District Attorney Pat Meehan. The candidates are vying to succeed Democratic Rep. Joe Sestak, who is the state's Democratic nominee for the Senate. Sestak, a former Navy admiral, defeated incumbent Sen. Arlen Specter in a May 18 primary.
Both Charlie Cook and Stuart Rothenberg, two highly respected non-partisan political handicappers, rate the race between Lentz and Meehan as a pure toss up, offering the Republicans a chance to make a crucial pick-up in their hopes of reclaiming control of the House of Representatives. The GOP needs to win back 39 Democratic-held seats to regain the majority in the chamber.
Later Monday, Biden attends a campaign event in Baltimore for Maryland Gov. Martin O'Malley, who is facing a rematch against former Gov. Robert Ehrlich. O'Malley defeated the Republican incumbent in 2006 when Ehrlich was bidding for a second term in office. Rothenberg rates the race as "toss-up/tilt Democrat" and Cook categorizes it as "lean Democrat."
The Democrats are trying this year to hold onto their majorities in the House and Senate and their advantage in governorships, amid a rough political climate that is working against incumbents.
"I don't think the losses are going to be bad at all. I think we're going to shock the heck out of everybody," Biden said Sunday on ABC's "This Week."
"We're going to be in great shape," added Biden.
Biden has become the go-to guy for the Obama administration to help out Democratic candidates in this year's midterm elections.
–Follow Paul Steinhauser on Twitter: @psteinhausercnn