Senate Republicans may be about to make the same mistake they often do when attempting to outline a platform: proposing policies that are impossible to implement.

Politico reports that a bloc of Senate Republicans, led by Lindsey Graham, "is agitating for party leaders to unveil a policy manifesto" that would explain to voters what the GOP would do if it took the majority in the midterm elections. This is yet another sign that the Republican Party realizes it needs a new political strategy, now that Obamacare has rebounded. A new "Contract With America"—the party's midterm platform in 1994, on which this 2014 manifesto would be modeled—could prove successful at the polls.

But as a governing strategy, this manifesto will only make legislating more difficult if the GOP takes the Senate. That’s because Republicans have a bad habit of overpromising.

In 2012, Mitt Romney promised a mathematically impossible tax-reform plan to lower all rates by 20 percent and cut the corporate rate, making up the revenue by closing unspecified tax preferences. When House Ways and Means Chairman Dave Camp released his tax reform plan in February, he attempted to cut rates and consolidate the tax code, but struggled to make up the lost revenue, eventually creating a top rate of 35 percent, implementing a bank tax, and taxing a percentage of capital gains as ordinary income. Republicans predictably ran away from Camp's reasonable plan.

Marco Rubio has proposed reforming the federal government’s antipoverty system. But his plan is mathematically impossible: He proposes increasing benefits for childless workers, keeping them unchanged for everyone else, and not increasing the deficit. He has yet to release legislative language for the plan, but those three goals are irreconcilable.