Rep. Paul Ryan and his Medicare plan are all the buzz on the campaign trail, but Mitt Romney’s VP choice has not given him the anticipated bump in the polls

 Mitt Romney’s choice of Paul Ryan to ride shotgun was supposed to be a game-changer — but the polls have barely budged.

The first tracking poll taken after the Wisconsin Congressman was added to the GOP ticket over the weekend reveals that Ryan has yet to provide a real bump

for Romney.

The presumptive Republican presidential nominee was polling at 46% in the days before he tapped the conservative darling to be his VP, according to Gallup.

And in the four days after Romney unveiled his selection of Ryan, his support increased no further than 47%, the polling firm found.

Gallup suggested that a bounce may still be on the horizon, since Ryan’s numbers were slightly better on Tuesday than they were last Saturday, when the

choice was made official.

However, another Gallup poll suggested that voters were skeptical of Ryan. Only 39% of voters thought Ryan was an “excellent” or “pretty good” choice,

while 42% thought he was “only fair” or “poor.”

Romney — who should receive a more sizeable surge after the Republican National Convention at month’s end — bested President Obama 47% to 45% in the

Gallup poll released Wednesday. Most recent national polls have shown Obama in the lead by a handful of percentage points.

The President wrapped up his three-day bus tour of the crucial swing state of Iowa on Wednesday by unleashing a vicious attack on the Republican plan to

transform Medicare — the central reason why critics say Ryan’s addition to the ticket was a mistake.

“I think they know their plan is not very popular,” said Obama at a rally in Dubuque. “You can tell that because they are being dishonest about my plan.

Especially when it comes to Medicare.”

The most controversial aspect of Ryan’s proposed budget, which Romney has largely endorsed, is to transform Medicare into a voucher program — which critics

believe would leave senior citizens without adequate health care.

Obama also ripped Romney’s tax proposals, calling it “trickle-down snake oil” — some of the harshest language the President has directed at his opponent

during the campaign.

Romney will return to the Hamptons on Friday for a pair of big-money fund-raisers. Last month, the GOP candidate was the guest of honor at a $50,000-per-

person event at the oceanfront estate of conservative titan David Koch, part of a fund-raising sweep of Long Island’s glitzy South Fork.