US STOCKS-Wall Street lower for 2nd day; healthcare is sole gainer
* ADP misses February expectations, January revised higher
* Markit, ISM services show modest growth
* Healthcare stocks rise after Supreme Court hearing
* Indexes off: Dow 0.47 pct, S&P 0.4 pct, Nasdaq 0.18 pct (Updates to late morning, adds healthcare moves)
By Sinead Carew
NEW YORK, March 4 (Reuters) - U.S. stocks were lower on Wednesday, with indexes on track for a second straight day of declines after a recent rally, with healthcare stocks the only bright spot after a U.S. Supreme Court hearing.
The S&P 500 healthcare index rose 0.31 percent as investors bet that the Supreme Court may lean toward the Obama administration's view on the Affordable Care Act after it heard a second major challenge to the law.
"I think that hearing assuaged fears - at least for now - that we were headed for overturning of Obamacare," said Quincy Krosby, market strategist at Prudential Financial in Newark, New Jersey.
The sector's top gainers were HCA Holdings, Tenet Healthcare and Universal Health Services. Continuación...