\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Within-Legislator Results (By Congress), 2009-2016 \label{TableFEByCongMRP}}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}\\
\hline
Electoral Security (MRP)&    -18285.4\sym{*}  &    -19153.1\sym{*}  &                     &                     \\
                    &    (8546.4)         &    (8654.3)         &                     &                     \\
[1em]
Electoral Security (Cook)&                     &                     &    -41271.3\sym{***}&    -38354.9\sym{**} \\
                    &                     &                     &   (12233.6)         &   (12522.1)         \\
[1em]
DW-Nominate (First Dim.)&                     &    477395.3\sym{***}&                     &    445025.3\sym{**} \\
                    &                     &  (141274.3)         &                     &  (146442.2)         \\
[1em]
Retiring            &                     &    -20970.5         &                     &    -23812.8\sym{+}  \\
                    &                     &   (12943.5)         &                     &   (12755.0)         \\
[1em]
House Tenure        &                     &     12295.0         &                     &     10693.6         \\
                    &                     &   (10958.6)         &                     &   (10106.1)         \\
[1em]
Majority            &                     &      -354.8         &                     &     -2200.4         \\
                    &                     &    (5876.3)         &                     &    (5779.2)         \\
\hline
\(R^{2}\)           &       0.459         &       0.473         &       0.466         &       0.478         \\
Observations        &\num[group-separator={,}]{1770}         &\num[group-separator={,}]{1769}         &\num[group-separator={,}]{1770}         &\num[group-separator={,}]{1769}         \\
Number of House Members&\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         \\
Member Fixed Effects&         Yes         &         Yes         &         Yes         &         Yes         \\
Congress Fixed Effects&         Yes         &         Yes         &         Yes         &         Yes         \\
\hline\hline
\multicolumn{5}{l}{\footnotesize Heteroskedasticity robust standard errors clustered at the member level in parentheses}\\
\multicolumn{5}{l}{\footnotesize \sym{+} \(p<0.1\), \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
