New Sen. Heidi HeitkampHeidi HeitkampMcCain having 'conversations' with Dems on Gorsuch nomination Dem leaders give centrists space on Gorsuch Senate Dems to Trump: Work with us on ObamaCare MORE (D-N.D.) tweeted a photo of her first steps into her new Senate office. Sen. Jeff FlakeJeff FlakeFlake teases report with plea to protect alpacas from 'tax code abuse' McCain having 'conversations' with Dems on Gorsuch nomination Obama FCC's 'privacy' rules were a sham MORE (R-Ariz.) tweeted that not only is it his first day as a senator, his daughter got engaged at the Capitol the day before.

Returning members were excited, too. Some, such as Reps. Ileana Ros-Lehtinen (R-Fla.) and Bruce BraleyBruce BraleyTen years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer Criminal sentencing bill tests McConnell-Grassley relationship MORE (D-Iowa), shared a first look at their new gear for the 113th Congress, such as ID badges and congressional pins officially marking them as members.

Others welcomed back Sen. Mark KirkMark KirkObamaCare repeal bill would defund Planned Parenthood Leaked ObamaCare bill would defund Planned Parenthood GOP senator won't vote to defund Planned Parenthood MORE (R-Ill.), who spent all of 2012 recovering from a stroke. Kirk was able to walk up the outside steps of the Capitol, with some help from Vice President Biden and Sen. Joe ManchinJoe ManchinSenate Dems to Trump: Veto broadband privacy repeal McCain having 'conversations' with Dems on Gorsuch nomination Live coverage: Senate intel holds first public Russia hearing MORE (D-W.Va.).

Several of Kirk’s colleagues in the Senate, as well as members of the Illinois delegation, welcomed him back. Kirk also tweeted a thank-you “for all the support.”

Sen. Lindsey GrahamLindsey GrahamOvernight Finance: Dems seek probe of acting SEC chief | Defense hawks say they won't back short-term funding | Senate seen as start point for Trump infrastructure plan | Dems want more money for IRS Overnight Defense: Pentagon considers more troops for Afghanistan | McCain, Graham won't back short-term funding | GOP defends Trump rules of engagement McCain and Graham: We won't back short-term government funding bill MORE (R-S.C.) was thinking of the new senator from South Carolina, former Rep. Tim ScottTim ScottNew bill does hard job of injecting capital into needy communities A better economic policy Republicans rebuke King for racial remarks MORE (R), who was selected by South Carolina Gov. Nikki Haley (R) to fill former Sen. Jim DeMint’s (R-S.C.) seat.

And many other members thanked their constituents and expressed hope for a more bipartisan Congress this session.