Sen. Elizabeth Warren didn't react kindly to the Senate Republicans and Mitch McConnell blocking her student loan bill, which would have "allowed an estimated 25 million people with older student loans to refinance that debt at current, lower interest rates."

Elizabeth Warren To Hit Back At Mitch McConnell By Campaigning For Alison Lundergan Grimes:

Sen. Elizabeth Warren (D-Mass.) railed against Senate Minority Leader Mitch McConnell (R-Ky.) on Wednesday for failing to support her student loan refinancing proposal, which the Senate killed in a 56-38 vote earlier in the day.

Warren's bill would have enabled millions of Americans to refinance their student loans into cheaper debt by increasing taxes on wealthy households. Following the bill's defeat, Warren told MSNBC that McConnell, who called the proposal a "show vote," has made clear where his allegiance lies.

"Mitch McConnell is there for millionaires and billionaires," Warren said. "He is not there for people who are working hard playing by the rules and trying to build a future for themselves."

When MSNBC's Chris Hayes asked Warren how she planned to fight back, the senator gave a response that could shake things up in Kentucky, where McConnell faces a tough race for reelection against Democrat Alison Lundergan Grimes.

"One way I'm going to start fighting back is I'm going to go down to Kentucky and I'm going to campaign for Alison Lundergan Grimes," Warren said. "She's tough, she's feisty, she endorsed the student loan bill, said she wanted to bring down interest rates for Kentuckians. ... So my view is I'm going to get out there and try to make this happen for her." Read on...