Now many investors fear there will be no comprehensive bipartisan deal and, at best, there will be an ad hoc arrangement to avoid default which will may lead to a downgrade of the US government's credit rating from AAA to AA. That has seen the Australian share market slide heavily - the All Ordinaries lost 73 points to close at 4,539, while the ASX 200 also fell 1.6 per cent to finish the day at 4,464. Macquarie Group was one of the worst performers among the top companies.