51.   But he said he would push on with the campaign.

52.   But even as Stevens was speaking, Republicans were pushing ahead with impeachment proceedings in Washington.

53.   But many Republicans say they must push ahead with their solemn duty and not be swayed by opinion polls.

54.   But Moscow has dismissed the criticism and pushed ahead with its offensive.

55.   But Senate leaders will push ahead with their plans this summer.

56.   But the intrepid Mario Gabelli is pushing ahead with an initial public offering.

57.   But the state is pushing on with the project, trying to provide jobs where virtually none exist outside of farming.

58.   But US officials Monday stressed their determination to push ahead with a search for a negotiated peace.

59.   Caterpillar is pushing ahead with its plant, and production there should begin on schedule in December.

60.   Clinton is eager to push ahead with a raft of domestic policy initiatives.