Washington (CNN) -- Republican presidential candidate Mitt Romney is trying to shift into high gear, but elections experts say his campaign seems to be stuck in second. With just weeks before the nominating conventions and his national debut before a broader electorate, Romney's struggles to make the case that he is best equipped to pull the nation out of the economic doldrums could derail his quest for the presidency. Romney's biggest challenge? Turning the conversation back to the weak economy and poor job growth and away from President Barack Obama's re-election campaign's attacks on his tenure at private equity firm Bain Capital and refusal to release more tax records.
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GOP presidential hopeful Mitt Romney's campaign has struggled to gain traction
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President Barack Obama's campaign attack ads have taken a toll
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Polls show Romney lags on what experts say should be his strongest area: the economy
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Romney will have to choose a strong running mate, give great convention speech
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