Conor Lamb's challenge: Build his name. Take down Fetterman. And do it all with less money.

Conor Lamb has two big problems.

To win Pennsylvania's Democratic Senate nomination, he has to catch John Fetterman. And he has to do it with less money. Allies of the Pittsburgh-area congressman are hoping a new super PAC can help overcome both, by raising cash from big donors to close a $3 million gap with Fetterman, the Democratic front-runner.

But it's not clear if that cavalry will actually arrive — especially without support from national Democrats like Senate Majority Leader Chuck Schumer, D-N.Y., or the allied groups that factored so heavily into Pennsylvania's 2016 Senate primary.