Midterm elections are less than six months away, and Republicans still can't agree on what it will take to win.The latest debate among party insiders is whether GOP House and Senate candidates should produce a document like the Contract With America that tells voters what to expect if Republicans win full control of Congress. But the fact there is a debate at all indicates the race is not shaping up as Republicans envisioned months ago.Much of the anxiety concerns Obamacare. The six months between October and March saw the disastrous rollout of the exchanges, steep increases in premiums and deductibles for millions of Americans, the imposition of the individual mandate, higher taxes and other troublesome features of the Democrats' national health care scheme.