Coulter is absolutely right. Also, making Obama own the economy is the principled thing to do: saving the country from insolvency and decline comes before any pledge not to raise taxes. While taking the Senate in 2 years and the WH in 4 may change the country's economic trajectory, none of the agreements that can be negotiated now will.
Conservatives should stand firm on establishing a hard debt ceiling for the sake of our children, but let everything else go unimpeded. Even the people that voted for Obama will support not using our children's credit cards to pay for our expenses and after 2 years without borrowing money from the future, they may have a different view of Obama's economic policies.