US STOCKS-Wall St rallies, Nasdaq up for 6th straight session
* Nasdaq on track for best six-day streak since Dec. 2011
* Investors credit weakness in data to poor weather
* Cisco falls after results, but tech sector rises
* Indexes up: Dow 0.3 pct, S&P 0.5 pct, Nasdaq 0.7 pct
By Ryan Vlastelica
NEW YORK, Feb 13 (Reuters) - U.S. stocks advanced on Thursday, putting the Nasdaq on track for a sixth straight day of gains as investors looked past disappointing data on consumer spending, chalking the weakness up to weather instead of weaker fundamentals.
The Nasdaq is up about 5.6 percent over the past six sessions, its best six-day advance since December 2011. Both the Dow and S&P 500 are on track for their fifth gain out of the last six sessions.
Indexes opened lower but gained throughout the session, although Cisco Systems, which sank after warning about a slump in revenue, limited the Dow's advance.
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