Ambac Financial ( ABK) downgraded at Friedman, Billings Ramsey from Outperform to Market Perform. Stock lacks catalysts, and will likely fall while credit quality is deteriorating. $50 price target. Advanta ( ADVNB) downgraded at FBR from Outperform to Market Perform. $17.50 price target. Company posted a large earnings miss, and is likely to experience greater-than-expected credit deterioration. Aetna ( AET) upgraded at Citigroup to Buy. $66 price target. Estimates also raised, as the company's commercial insurance losses have stabilized. Franklin Resources ( BEN) downgraded at FBR to Market Perform. $134 price target. Company is posting strong sales growth, but the company is struggling to produce operating leverage with its current sales mix. Borg Warner ( BWA) upgraded at Deutsche to Buy from Hold. Cites one of the few in industry that fundamentals support double digit top line and bottom line growth long-term. Raised target price to $115 from $97. Choice Hotels ( CHH) downgraded at Wachovia to Underperform from Neutral. Cites potential risk to estimates considering company is trading at a richer valuation compared to peers. Comcast ( CMCSA) downgraded at CIBC to Sector Perform. Company posted poor third quarter results, as telecom competition is heating up. Cummins ( CMI) upgraded at Citigroup to Hold from Sell. Cites sharp sell-off brings valuation back in-line. Raised target price to $126 from $85.