I say buy as much as you can afford as soon as possible. The reason I think that is I believe that the current administration will do whatever it takes to get re-elected and here's the main reason why: control of The Supreme Court of the United States. Just look at the ages of the Justices listed;
103 Antonin Scalia NY DOB 1936– 1986–present — — Reagan Currently serving
104 Anthony Kennedy CA DOB 1936– 1988–present — — Reagan Currently serving
106 Clarence Thomas GA DOB1948– 1991–present — — Bush, G. H. W. Currently serving
107 Ruth Bader Ginsburg NY DOB 1933– 1993–present — — Clinton Currently serving
108 Stephen Breyer MA DOB 1938– 1994–present — — Clinton Currently serving
109 John G. Roberts† MD DOB 1955– 2005–present 2005–present — Bush, G. W. Currently serving
110 Samuel Alito NJ DOB 1950– 2006–present — — Bush, G. W. Currently serving
111 Sonia Sotomayor NY DOB 1954– 2009–present — — Obama Currently serving
112 Elena Kagan NY DOB 1960– 2010–present — — Obama Currently serving
If any of the conservative Justices are replaced the Constitution as we know it will be history. Obama said it was a flawed document and with one more liberal justice he will have his chance to "fix" it.
103 Antonin Scalia NY DOB 1936– 1986–present — — Reagan Currently serving
104 Anthony Kennedy CA DOB 1936– 1988–present — — Reagan Currently serving
106 Clarence Thomas GA DOB1948– 1991–present — — Bush, G. H. W. Currently serving
107 Ruth Bader Ginsburg NY DOB 1933– 1993–present — — Clinton Currently serving
108 Stephen Breyer MA DOB 1938– 1994–present — — Clinton Currently serving
109 John G. Roberts† MD DOB 1955– 2005–present 2005–present — Bush, G. W. Currently serving
110 Samuel Alito NJ DOB 1950– 2006–present — — Bush, G. W. Currently serving
111 Sonia Sotomayor NY DOB 1954– 2009–present — — Obama Currently serving
112 Elena Kagan NY DOB 1960– 2010–present — — Obama Currently serving
If any of the conservative Justices are replaced the Constitution as we know it will be history. Obama said it was a flawed document and with one more liberal justice he will have his chance to "fix" it.