On the final day of the first quarter - new records for the Dow and S&P 500. The S&P 500 finally breached its pre-financial crisis record close, settling at 1569. The Dow set a historic peak too at 14,578. And that wraps up the biggest first-quarter rally on Wall Street since 1998. John Canally of LPL Financial says he won't be surprised if investors lose heart in coming months.