But if, as now, they are controlled by different parties, the prime minister has considerable sway, for instance over the economy.
Police consider this one of the toughest projects because it is so large and the maze-like communities inside are controlled by different, often-feuding gangs.
If different offices are controlled by different parties, the governmental process may be marked by greater conflict than would otherwise be the case.
Congressional committees, by contrast, are invariably dominated by the majority party and rarely conduct thorough investigations of the executive branch unless Congress and the White House are controlled by different parties.
But there is more doubt whether Washington can quickly agree on fiscal policy moves — that is, raising spending or cutting taxes — in an election year in which the White House and Congress are controlled by different parties.
When the legislative and executive branches of government are controlled by different parties, the regulatory agencies typically take more moderate positions as they walk a line between Congress and the White House.
That's why it's odd to see major gains for either party in Congress when the two branches are controlled by different parties (even if the US senate has a slim Democratic majority).
Taras Chornovil, a former MP from Yanukovych's party who led his 2004 presidential campaign, said that factions inside the Rada are controlled by different oligarchs and these poweful players are yet to decide whether to ditch the president or keep faith with him.
These effects appear to be statistically significant in cases in which the House and the presidency are controlled by different parties as well as those in which they are controlled by the same one, although the small sample sizes make it hard to know for sure.
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