John Hood has offered well-reasoned arguments explaining how the electoral math points toward a Mitt Romney victory in the Republican presidential nomination contest. Writing for Commentary‘s blog, Jonathan S. Tobin offers a different perspective.

Even if, as I expect, Gingrich stays in the race after losing the last two states where he could have been said to have had a chance to win, Santorum is now in a position to do some real damage to the Romney juggernaut in the upcoming weeks. With polls already showing Romney having only a slight lead over Santorum in a large state like Illinois where he ought to win, Tuesday’s victories allow the Pennsylvanian to hope he can add to his string of upsets. If Santorum ends March by stacking up victories in Illinois, Louisiana and Missouri, then although he will still be trailing badly in the delegate count, his path to the nomination won’t look quite so much of a fantasy as it did a few weeks ago. Though Romney will still have impressive advantages, so long as the votes are still be counted state by state, momentum has a way of overwhelming math.

At the bottom of this equation remain two hard facts that remain the key factors in the GOP race.

One is the undeniable problem that Romney has with conservative voters. Due to his flip-flops on the issues during the years, they neither trust nor particularly like him. Though he has tried hard to demonstrate that his positions are now as conservative as any of his rivals, he simply doesn’t have a way to convince evangelicals or Tea Partiers that he understands and shares their values. Should he become the Republican nominee, I believe most would ultimately back him as the only alternative to four more years of Barack Obama but until then, the majority on the right will always prefer to cast their primary and caucus ballots for someone they can more readily identify with. Though even most conservatives know that Santorum is less electable than Romney, he will be able to count on the votes of conservatives so long as there is any chance he can win the nomination.

The second fact is that Romney continues to benefit from a divided conservative field. Though Gingrich spent most of his speech Tuesday night mocking Romney rather than acknowledging his own defeat, the man he derides as a “Massachusetts moderate” is the prime beneficiary of his decision to stay in the race.