Homebuilders didn't benefit from Tuesday's S&P/Case-Shiller index improvements, but the Census Bureau data seemed to cause a multiplier effect. The homebuilder spike was led by D.R. Horton ( DHI), which was up 1% at mid-day, a welcome change for the stock after the pummeling it took last week on weak earnings. Skyline ( SKY) was up 4.5%; Hovnanian Enterprises ( HOV) was up 2%; while KB Homes ( KBH), M.D.C. Holdings ( MDC), and Pulte Homes ( PHM) were all trading up slightly at mid-day. While the positive gains were small for many of the homebuilders, a broadly positive trend is welcome news for the beleaguered sector. Only two major names in the sector were down at mid-day: The stock price of he Ryland Group ( RYL) was down 0.6%; while luxury homebuilder Toll Brothers ( TOL) was down 0.3%. It was just a few weeks ago that a better-than-expected outlook from Toll Brothers sent the entire sector up. Today, instead of leading the industry surge, Toll was missing out on it. -- Reported by Eric Rosenbaum in New York Follow TheStreet.com on Twitter and become a fan on Facebook.