'An absolute groundswell': Bernie Sanders draws record crowds in rallies across the U.S.

Brendan Buck , FA Shakur, Symone Sanders Taos and Brendan Buck join CNN Opinion Opinion Radio on Sunday at 9 p.m. ET .

Foz, Foz Shakur and Bernie Sanders' senior advisor to Bernie Sanders , former House speaker Paul Ryan and House speaker John Boehner .

Brendan Buck : There is a clear grassroots push and pull that's going on here. The push is by the grassroots trying to pull elected officials to hear what they're having to say.

Shakur: Bernie Sanders tapping into a frustration that people have and I want to be heard.

Where do you think Republicans are right now and what do you see as at this moment for them, a vulnerability, big or small? We could see a situation where we kind of get stuck. I think the House and the Senate are about to get stuck and you have you started narrative where you can't actually get anything done, where all this other chaos is going on.

Republican Sen. Ted Cruz says the GOP will not be able to get much of anything done.

Cruz: "They're going to have a bunch of members who say this is our one opportunity to cut spending. And then the political reality is going to set in" Cruz : 'Common sense' Republicans will jerk the party back into reality.