Instead of responding to Romney's critical view of Santorum, based on reality, one might add, you instead make irrelevant comments about Newt Gingrich's space proposal. That tells me a whole lot about what even Santorum's supporters seek to run and hide from.
My preference is Newt but Romney comparing Santorum to Obama is either a meaningless off-the-cuff sound bite or a sign of desperation.
Obama was a no-show member of the Illinois legislature and a half-term senator when he got the job as President.
Santorum has a long history of legislative leadership, and if the subject is job creation he can always respond that he was the one who wrote welfare reform which did create jobs.