51.   But his decision to play the character card comes late and tax cuts are a tough sell when when the economy is growing.

52.   But even with such incentives, it may be a tough sell.

53.   But he and others say the glitzy new features will be a tough sell to business users who may balk at the price.

54.   But it has been a tough sell.

55.   But it was a tough sell.

56.   But it is a tough sell.

57.   But it will be a tough sell.

58.   But judging from the anecdotal evidence gathered from different parts of the country, Wright said, Nixon has been a tough sell.

59.   But last week it became clear that the Reno-McCaffrey plan will be a tough sell.

60.   But in several interviews Thursday, the initial reaction seemed to serve as a warning that the idea could be a tough sell.