When politicians spend more time playing party politics than they do trying to run the country, regardless of their party affiliation...THAT becomes a major problem.
Voters who are so wrapped up in "We have to elect our guy, no matter what" are a major problem.
Politicians should be willing to work together instead of adhering to a strict party line. The whole "Grover Norquist worship" on the right is bullshit and is an example of what's killing our country. I'm sure there is something similar on the left side...but I'm not aware of what it is.