BMO Capital Markets Dave Shove has raised his rating on shares of HealthSpring (Ticker: HS) to 'market perform' from 'underperform' and hiked his price target to $32 from $20. Setting aside the call's significance given HealthSpring's 55 percent year-to-date rise, what's interesting about the call is the Shove sees Washington's winds turning in the Medicare Advantage insurer. Alongside margin expansion, that sets the stage for a pretty powerful 2011.