GOOD LUCK WITH THAT: Obama to huddle with Hill Democrats on saving Obamacare.

President Barack Obama will head to Capitol Hill Wednesday to meet with congressional Democrats about how to shield Obamacare from Republican efforts to dismantle it, a Capitol Hill source told Politico.

But:

Still, if the pillars of Obamacare are successfully dismantled, moderate Democrats — particularly those senators up for reelection in 2018 — could come under considerable pressure to help Republicans replace the law and are already openly entertaining that option.

And here’s the big but:

Democrats reeling from a devastating election face a daunting task: the 2018 Senate map.

It favors Republicans in a big way. The GOP will be defending just eight seats, while Democrats must fight for 23 — plus another two held by independents who caucus with Democrats.

What’s worse is the fact that many of the seats they must defend are in states won by Republican Donald Trump.

If Democrat Senators Bill Nelson (FL), Joe Donnelly (IN), Claire McCaskill (MO), Jon Tester (MT), Heidi Heitkamp (ND), Sherrod Brown (OH), Bob Casey (PA), Joe Manchin (WV), and Tammy Baldwin (WI) are smart, they’ll pay better attention to their constituents next year, than Senate Democrats did in 2009 before voting for ObamaCare.