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President Obama’s ability to help his party in a time of waning political fortunes will face a big test next week as he embarks on a West Coast fund-raising swing to help congressional Democrats stock their 2014 campaign coffers. The quest is made all the more urgent by the bungled launch of his health care law and its use as a bludgeon by Republicans trying to seize control of the Senate. Moreover, the stakes are increasing for the Democrats just as the president is getting weaker, with his lowest approval ratings of his presidency weighing him down as the midterm election cycle kicks into full gear.