The fee would be charged to patients for ambulance service, but it would be paid for by health insurance in most situations. People without health insurance and people below a certain income threshold would be exempt from the fee. County officials stress that county residents would neither see a bill nor incur out-of-pocket expenses.

In a 6-3 vote earlier this month, the Montgomery County Council approved the bill, which generally would allow legislators to prevent county officials from selling lucrative county properties. The legislation was part of a slew of bills the body considered to boost local economic development.

Aides to O’Malley said they were told the decision came after the NBC talk show scored an interview with Jamie Dimon, the chief executive of JPMorgan Chase, which announced a staggering $2 billion trading loss this week.

The fee would be charged to patients for ambulance service, but it would be paid for by health insurance in most situations. People without health insurance and people below a certain income threshold would be exempt from the fee. County officials stress county residents would neither see a bill nor incur any out-of-pocket expenses.

Given Maryland’s status as a reliably blue state, it’s unlikely the president will campaign much in Maryland before appearing on the November ballot against Mitt Romney, the presumed Republican nominee. But the Free State remains an attractive destination for money.

Host David Gregory previewed the show and its topics during an appearance Friday morning on MSNBC.

Scenes from “Better Living Through Chemistry” — a film that features actors Olivia Wilde, Ray Liotta and Sam Rockwell — were being shot on the street that encircles the State House in Annapolis.

Groups on both sides of the issue — which will likely be decided by Maryland voters — have weighed in on the president’s pronouncement. Not surprisingly, they have come to different conclusions.

The fee would be charged to patients, but it would be paid for by health insurance in most situations. People without health insurance and people below a certain income threshold would be exempt from the fee.

O’Malley’s March is booked on the night of May 28 at the Rams Head, a venue in Annapolis just around the corner from the State House.