Southern Arizona Congressman says it will be difficult to work with White House.
Plus, looking ahead with a Border Patrol union rep; looking back with political analysis.
19,000 provisional ballots found valid; late count not expected to affect results.
Democrats had hoped to make up ground, but both chambers largely unchanged.
Immigration likely to be key issue in new presidency, and Arizona is a border state.
The party is hoping to regroup after what it sees as a surprise loss.
Party leadership needs new people, new consultants, new message, he says.
Rising costs, including premiums, make health care plan unacceptable, he says.
Government officials say Peña Nieto wants to open dialogue early.