Wall Street rallies as strong earnings reports boost optimism

The S&P and the Nasdaq were on track for their best day this month on Tuesday as a slew of market-beating results from marquee companies boosted optimism about Corporate America's health. The spotlight was on the healthcare sector, which rose 1.04 percent, the most in more than one month, after UnitedHealth's upbeat forecast. UnitedHealth rose 6.3 percent and boosted its fellow health insurers.