Obama's Response

President Barack Obama had discussed midterm elections on Rev. Al Sharpton's radio show, where he said he recognizes how the Democratic Party is distancing themselves from him. 
“This isn’t about my feelings being hurt,” he said. “These are folks who are strong allies and supporters of me and I tell them, ‘You know what? You do what you need to do to win. I will be responsible for making sure that our voters turn out.'” (source: http://newsone.com/3064801/president-obama-midterm-voter-turnout-democrats-blacks/)
Regardless, he also said that things would still be fine for the party during elections.

(source: http://www.cnbc.com/id/102063107)

During their elections, Democratic candidates are trying their best to disassociate from the President, due to his falling approval rating and recent scandals involving the government. Senators are currently saying that him trying to aid Democratic candidates will do more harm than good, as Republicans are using anything Obama does as fuel for their own elections, as Senator Joe Manchin said. (source: http://www.bloomberg.com/politics/articles/2014-10-21/republicans-pounce-on-obamas)