During Yeltsin's presidency (1991–1999) oligarchs became increasingly influential in Russian politics; they played a significant role in financing the re-election of Yeltsin in 1996. With insider information about financial decisions of the government, oligarchs could easily increase their wealth even further. The 1998 Russian financial crisis hit some of the oligarchs hard, however, and those whose holdings were still based mainly on banking lost much of their fortunes.