Here are my concerns about a Martin O'Malley candidacy ...

[FSogol]

14. Same here. O'Malley isn't just talk, he's accomplished many of the things he discusses.

As for the "Martin Who", he is also someone who can make up great deficits to win elections. For example (from wiki):

In 1990, O'Malley ran for the Maryland State Senate in Maryland's 43rd Senate District. He challenged one-term incumbent John A. Pica in the Democratic primary and lost by just 44 votes. O'Malley was considered an underdog when he first filed to run but "came out of nowhere" to lead Pica on election night. O'Malley eventually lost the race when absentee ballots were counted. In 1991, he was elected to the Baltimore City Council to represent the 3rd District and served from 1991 to 1999

O'Malley announced his decision to run for Mayor of Baltimore in 1999, after incumbent Kurt Schmoke decided not to seek re-election. O'Malley's entrance into the race was greatly unexpected, and he faced initial difficulties, being the only Caucasian candidate for Mayor of a city which is predominantly African-American. O'Malley's strongest opponents in the crowded Democratic primary of seven were former City Councilman Carl Stokes, Baltimore Register of Wills Mary Conaway, and Council President Lawrence Bell. In his campaign, O'Malley focused on reducing crime, and received the endorsement of several key African-American lawmakers and church leaders, as well as former Mayor of Baltimore and Maryland Governor, William Donald Schaefer. On September 14, O'Malley won the Democratic primary with 53%. O'Malley went on to win the general election with 90% of the vote, defeating Republican nominee David Tufaro.

In 2003, O'Malley ran for re-election. He was challenged in the Democratic primary by four candidates, but defeated them with 67% of the vote. In the general election, he won re-election with 87% of the vote.

and as governor:

In 2010, O'Malley announced his intention to run for re-election, while Ehrlich announced he would also run, setting up a rematch of 2006. Despite major losses for Democrats nationwide, O'Malley defeated Ehrlich 56%–42%, receiving just over one million votes.

On a personal level, I don't feel Sanders can win nationally and feel that once the inevitability of HRC wears off, O'Malley will soar into the lead. O'Malley's views are similar to Sanders, but as a proven executive, he has been able to have results that are out of the reach of most legislators. Likewise, while HRC enjoys 75% of Democratic party support at the moment, I am not sure the support is as solid as she hopes. She proved beatable in 2008 and waffles on controversial issues. Her support is because many Democrats believe she is the only one that can win against the Repubs. Once someone else proves they are a force (perhaps with some strong first or 2nd place showings in the earliest 10 primaries), her support will drop. Just my 2 cents, unadjusted for inflation.

For more info on O'Malley accomplishments and views, check out DU's O'Malley group:
http://www.democraticunderground.com/?com=forum&id=1281