SACRAMENTO -- California's 51-day budget impasse ended today as Republicans in the state Senate extracted enough concessions from Gov. Arnold Schwarzenegger and Democratic lawmakers to allow the $145-billion spending plan to pass. The agreement is almost identical to the plan passed by the state Assembly on July 20. To overcome the GOP objections in the Senate, Schwarzenegger had agreed weeks ago to use his veto pen to eliminate the $700-million deficit with which the state is expected to end the fiscal year June 30, 2008.