Even some Democrats are doubtful that Mr. Obama's latest efforts will bear fruit.
It is doubtful that Mr Sendek's hella campaign, which had almost 60, 000 supporters earlier this week, will be able to trump tradition.
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And it is doubtful whether Mr Soros, a left-wing Democrat who has little sympathy with Israel, would be the best patron for such an organisation.
It is doubtful that Mr Berlusconi has the tact and restraint to play so self-effacing a role, which could be sorely required if bitter controversies emerge at the two biggest European summits where Mr Berlusconi will have to chair the meetings himself.
It is doubtful if either Mr Blair or Mr Ashdown yet knows clearly how fast and how far their engagement might extend.
Although it is doubtful whether all Mr Clinton's new spending initiatives make sense, this proposed path for discretionary spending at least does not imply swingeing (and short-sighted) cuts in an area that has probably been squeezed enough.
Doubtful about the accuracy of Mr. Hornsby's data, Mr. Berger checked it against the NFL data set and found Pro Football Focus was nearly perfect.
But without Mr. Kyl's support, 67 votes looks doubtful.
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PML-N's leaders, it is doubtful they could have produced much of a multitude to greet Mr Sharif.
U.S. officials are doubtful of any major breakthrough in Kazakhstan, in part because of Mr. Khamenei's fixation on the June elections.
Voters showing rather more savvy than foreign observers are doubtful whether a prime minister as unpopular as even his own party admits Mr Hun Sen to be could emerge stronger from a free vote.
Mr Lay said it was possible the penguin had been eaten, but that this was doubtful.
Mr Moi's commitment to reforming this shadow, and kleptocratic, power structure is doubtful, at best.
"If a store is only marginally profitable, any further costs like this might mean either they won't build new stores where they're doubtful about profitability, or they might close stores that might become unprofitable in the future, " Mr Naish said.
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